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(No Model. 2 Sheets-Sheet 2.

E. R. BEAVER.

DUST COLLECTOR. N0. 531,517. Patented D60. 25, }g94. g

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EmiZfZ V627,

' UNITED STATES PATENT OFFICE.

EMIL R. DRAVER, OF ALLIANCE, NEBRASKA, ASSIGNOR TO FLORENCE N. I

DRAVER, OF

SAME PLACE.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters meet No. 531,517, dated December 25, 1894.

Application filed June 25, 1894.

dust-laden air; but I have particularly designed my improvement for use with a middlings-purifier, and therefore hereinafter mainly confine thedescription to such use.

One object of my improvement is to provide automatic means for jarring the accumulations of dust from the dust-arresters of the apparatus and for shutting off the aircirculation from each dust-arrester while undergoing such jarring, thereby to prevent the dust from being blown away and insuring its precipitation from'the dust-arrester into the receptacle below, whence it is conveyed off.

My further object is to provide improved means for regulating the blast of air intro duced underneath the sifting-screen of the apparatus. r

Referring to the accompanying drawings- Figure l is a longitudinal sectional view of a middliugs-purifier provided with my improvements, the section being taken at the line 1 on Fig. 2 and viewed in the direction of the arrow. Fig. 2 is a transverse section of the same taken at the line 2 onFig. 1 and viewed in the direction of the arrow. F ig. 3 is a broken sectional view representing a modified construction of the automatic air-current controlling valve-device. Fig. 4 is abroken sec tional view of the air-current controlling means, the section being taken at theline 4 on Fig. 2 and viewed in the direction of the arrow; and Fig. 5 is a broken plan view of the air a current controlling means, showing the mechanism for alternately jarring the dust-.arresters. V

A is the casingof a middlings-purifier surmounted by an incased fan B. for drawing air throughthe machine, as usual. Within the casing, at the bottom thereof, are the parallel conveyer-containingtroughs C and O'fbr receiving and carrying oi the material sifted into them by the vibratory screen D, sus- Serial No. 515,629. (No model.)

pended above them, and from which the material is guided into the troughs by a hopper the hinged valve 0 between the troughs enables the material to be directed, at will, into either. p brush device F for keeping open the mesh to prevent clogging, and which is shown as a rotary shaft'r havingright and left threads each other, the opposite spiral threads being As thus far described th parts need involve commonly provided in middlings-purifiers.

r The sides of the hopper E extend through and beyond the opposite sides of the casing A,at openings therein, and form the inclined bases of air-boxes G and G',-provided at the outer sides of the casing and to which, respectively, lead the branches n and n of the discharge-pipe B from the fan B, wherebya continuous circulation of the same air may be had, by the operation of the fan, through the machine. In the openings in the sides of the casing'A through which the sides of the hopper E protrude, and at intervals on the inner surface s of the latter, are provided rigid cleats m; and at the opposite inner sides of the casing I provide plates or boards H, extending lengthwise of the casing and having formed in their lower ends, at intervals corresponding with those at which the cleats are provided, tostraddle the latter, recesses m, which should be of the same depth as the perpendicular width of the cleats. Toward the head-end of theapp'aratus, or end at which the material to be acted on is introduced through a feed-hopper M, vertical rodsl extend upward through the extended covers of the air-boxes G and G, above which covers they carry, on their threaded portions, wingnuts Z, by turning which the adj acentend portions of the wind-boards H may be raised or lowered, at will, to regulate the supply of air no featureslof novelty, but may be like those.

E, of which the troughs form the base; and

Below the screen is the travelingformed spirally upon it, and thus crossing 2 joined at the ends of the course of the brush- I from the air-chambers or air-boxes, thus to let in more at one side of the casing than at the other, or an equal amount at each side; the primary function of the adjustable windboards II being, however, to admit more air at the feed end of the machine than at the opposite end.

In the casin g between the fan 13 and screen D, I show the central troughs I supported to extend lengthwise of the casing and containing the traveling conveyers k, the trough being divided longitudinally between the conveyers by the cloth-covered frame forming a dust-arrester L, loosely supported in vertical position in the trough and confined at its ends between guide-cleats 2'. Flanking the trough I, at the opposite inner sides of the casing A, are the parallel troughs I and 1 each containing a traveling conveyer 7c and provided with a dust-arrester L, supported and otherwise substantially like the screen L. The arresters L and L are in no sense screens for sifting material through them, but serve merely to intercept the dust, and to that end the preferred cloth for covering their frames is of a woolly variety, like coarse blanketgoods, which best retains the dust till jarred ofi.

Hoods K and K are formed, to extend over the air-passages between the troughs, with the upwardly converging sides It and 72 extending respectively from the adjacent sides of the troughs I and I, and the similar sides It and h extending, respectively, from the adjacent sides of the troughs I and 1 the hoods being open along their apexes, over each of which is pivotally supported, on a rod t, a two-sided valve K or cap, adapted, by tilting it, to engage either side of the hood and there close it while opening the opposite side. These valves are rocked by engagement with their recessed crowns g, of heads 9 obliquely carried on a rotary shaft 9 carrying a belt-pulley o and geared with the shaft 0*, and also with the shaft 8 which drives the conveyers 7c and 7c. Adjacent to each of the dust arresters L, L, the shaft 9 carries a striker-arm f extending into the path of the free end of a knocker-device comprising a stifi spring e on the upper edge of the frame of such screen and bearing on an anvil or head (2. The striker-arms f are so set on the shaft as indicated by Fig. 5 that the central one engages the spring e on the arrester L, and the lateral ones engage the springs e on the arresters L successively in each revolution of the shaft.

The operation is as follows: With the fan in motion (being driven by the belt-pulley r on its shaft 11 and the boards H suitably adjusted, with the material to be treated introduced through the feed-hopper M upon the screen D while the latter undergoes a vibratory motion under its connection with the usual eccentric d, air is circulated by the fan upward through the casing A from the airboxes G and G, and back into the latter,

from which to re-enter the casing. The dust carried by the air is intercepted by the arresters L and L, by the firstnamed when the valves K are turned, as shown, to open the hood-outlets K and K at opposite sides of the arrester L, and by the last-named when the valves are turned to close the hood-outlets adjacent to the arrester L and open them to the arresters L. In the last-named condition of the valves K the central striker-arm f raises the free end of the adjacent spring 8 and, when the latter is released, or passed by the arm, it recoils with suflicient force against its head e to jar the dust arrester and precipitate the dust into the troughs I, from which the conveyers carry it to the discharge outlet 0. \Vhen the sides of the hood-outlets adjacent to the dust-arresters L are closed by the heads g in their rotation, the strikerarms f over those arresters engage, in a similar manner, the springs e thereon and jolt the collection of dust upon them into the troughs I, 1 from which their conveyers carry it to the discharge 0. Thus, as will be seen, the jarring of neither of the dust -arresters is allowed to take place till it is shut olf by a valve K from exposure to the air-current; so that the dust, which it is caused to shed, is not impeded from precipitation or carried off in the air-current.

In the modified construction of the air-current controlling means illustrated in Fig. 3, the cap K is stationary and alfords, in its crown, a bearing for a hinged valve or blade K adapted to be swung, by engagement of its upper end with the oblique head g on the rotary shaft 9 into closing contact alternately with the opposite sides of the hood it controls.

I wish it to be understood that my improved means for controlling the supply of air to the casing A and the valve-device for shielding a dust-arrester, during precipitation therefrom of dust, from the air-current may or may not be used together in the same apparatus; and also that the particular construction involved in my improvement, while believed to be best suited for my purpose, may be variously altered without thereby departing from my invention.

What I claim as new, and desire to secure by Letters Patent, is-

1. In combination with a suitable casing and a fan for forcing air through the same,

an air-passage in the casing leading to the fan, dust-arresters flanking said air-passage, an oscillatory valve supported between the dust-arresters and operating to open the course of the air-current and direct it toward each dust-arrester while closing the course to the other, means for oscillating the valve, and jarring means for thedust-arresters operating against each, in succession, when the course of the air-current thereto is closed by the valvlp, substantially as and for the purpose set fort 2. In combination with a suitable casing and a fan for forcing air through the same,

an airspassagein the casing leading to the fan and provided with a hood open along its succession, when the course of the air-current thereto is closed by the valve, substantially as and for the purpose set forth.

3. In combination with a suitable casing and a fan for forcing air through the same,

an air-passage in the casing leading to the fan and provided with a hood open along its top, dust arresters flanking said hood, an oscillatory valve supported to be turned into engagement with either side of said hood to close the outlet thereat, a rotary shaft carrying obliquely a head engaging said valve to oscillate it, and jarring means for the dustarresters on the shaft alternating in their operation with the valve-opening function of said head, substantially as and for the purpose setforth.

V 4:. In combination with a suitable casing having a fan for forcing air through the same and containing middlings-purifying mechanism, substantially as described, conveyorcontaining troughs above the screen D, afiording air-passages between them, hoods K and K extending over the air-passages, oscillatory cap-valves K supported over the hoods, dust arresters L, L supported to discharge into the troughs, a knocker-device for each dust-arrester, and a rotary shaft g carrying at intervals at the openings, wind-boards having recesses to coincide with said cleats and adj ustablysupported to increase and decrease, at will, the extent of opening between the cleats and recesses, and branches leading from the fan outlet-pipe to said air-boxes, substantially as described.

6. In combination with a suitable casing having a fan for forcing air through the same, a hopper E in the base of the casing protruding at its sides through openings in the sides of the casing and forming the inclined bases for air-boxes at said sides, cleats provided at intervals at said openings, wind-boards having recesses to coincide with said cleats and adj ustablysupported to increase and decrease, at will, the extent of opening between the cleats and recesses, and branches leading'from the fanoutlet-pipe to said air-boxes, substantially as described.

v '7. In combination with a middlings-purifier having a casing A provided with a fan B, middlings-purifying mechanism, substantially as described, in the casing, an air-passage in the casing, above the screen D, leading tothe fan and provided with a hood open along its top, dust-arresters flanking said hood, an oscillatoryvalve supported to be turned into engagement with either side of said hood to close the outlet thereat, a rotary shaft connected "With the valve to oscillate it and carrying jarring means for the dust-arresters alternating in their operation with the valve-opening function of the valve-connection with the shaft, air-boxes at opposite sides/of the casing and opening into the latter below said screen D and provided with air-regulating means, and branches leading into said boxes from the discharge-pipe of the fan, the whole being constructed and arranged to operate In presence off- CHARLES F. OARLETON, I

H. O. DRAVER. 

